Enabled Usage of _Cilk_spawn and _Cilk_sync in Cilk Runtime (libcilkrts).

+2013-12-13  Balaji V. Iyer  <balaji.v.iyer@intel.com>
+
+       * Makefile.am (GENERAL_FLAGS): Removed undefining of Cilk keywords.
+       * Makefile.in: Reconfigure.
+       * runtime/symbol_test.c: Added a #define to clear out _Cilk_for.
+

From-SVN: r205965